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multipath (SPF Options)


Hierarchy Level


Enable weighted equal-cost multipath (ECMP) for load-sharing data based on the bandwidth for incoming traffic destined to IS-IS neighbors that are at a one-hop distance. The IS-IS protocol gets the logical interface bandwidth information associated with the gateways of ECMP next hop and shares this information with the routing protocol process (rpd) and the Packet Forwarding Engine.

Instead of distributing traffic equally over multiple paths, weighted equal-cost multipath (ECMP) routing distributes traffic based on the total available bandwidth for each gateway of a next hop. It thereby distributes traffic unequally over multiple paths and utilizes available bandwidth more efficiently for better load balancing.


Weighted equal-cost multipath routing displays unequal traffic distribution prominently when the traffic flow is as heavy as 10000 flows.



Enable weighted ECMP for efficient load sharing.


Enable weighted ECMP load balancing on IS-IS neighbors that are just one hop away based on the interface bandwidth.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 15.1F4.